ajax.js?v=8.1.8:965 Uncaught AjaxError:
An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /d8/admin/structure/block/add/pnc_block_test/pnc?region=-1
StatusText: OK
ResponseText:
Fatal error:  Class 'DrupalCoreblockBlockBase' not found in /vagrant/src/d8/modules/custom/pnc/pnc_block_test/src/Plugin/Block/PncBlockTest.php on line 23